Broaching machine



Nov. 2, 1943. E. c. RAEHRS ET AL 2,333,337

BROACING MACHINE Filed July 31, 1939l 5 Sheets-Sheet l Nov. 2, 1943 E. c. RAI-:HRS l-:rAL 2,333,337

BROACHING MACHINE v Filed July 51, 1959 5 Sheets-Sheet 2 INVENTOR inf/Py C.' /9452/25' BY 627m M 554C# (vf-' l ATTORNEY.

Nov- 2, 1943. E. c. RAEHRS Em. y 2,333,337

BROACHING MACHINE Filed July 31, 1939 I 5 sheets-sheet 3 ATTORNEY.

Nov. 2, 1943. E. c. RAEHRS i ET A1.

BROACHING MACHINE 5 Smets-sheet 4 Filed July 3l, 1939 Nov. Z, 1.943. Epc. RAEHRs Erm. 2,333,337

BROACHING MACHINEl v Filed July' 3l, 1939 5 Sheets-Sheet 5- lf'cz 7 1NVENT0R Patented Nov. 2, 1943 BROACHING MACHINE- Emery C. Raehrs and Carl M. Beach, Cincinnati,

Ohio, assignors to The Cincinnati Milling Machine Co., Cincinnati, Ohio, a corporation of Ohio Application July 31, 1939, Serial No. 287,500

11 Claims.

This invention relates to machine tools and more particularly to improvements in broaching machines.

One of the objects of this invention is to provide a broaching machine which may be incorporated in the conveyor line of a high production system whereby the movements necessary for machining also constitute a part of the progress along the conveyor line.

Another object of this invention is to provide a breaching machine in which the idle return movement is utilized for removing the work from the machine and depositing it on a live part of the conveyor system.

A further object of this invention is to provide a simple and eflicient work carrier for receiving and feeding the work through the machine including means for automatically clamping and unclamping the work at the beginning and the end respectively of the feeding stroke whereby work will flow through the machine in streamlin fashion.

A still further object of this invention is to provide a tunnel type broaching machine having broaching tools set in a removable portion of the tunnel wall to facilitate inspection and replacement.

Still another object of this invention is to provide an improved work carrier which may be readily adjusted to position a corresponding surface on work of different heights lin the broaching plane of the machine.

An additional object of this invention is to provide suitable interlocks between the work iixture and the power control system to insure that the work is properly positioned and secured before power is applied to the machine.

Other objects and advantagesof the present invention should be readily apparent by reference to the following specication, considered in conjunction with the accompanying drawings forming a part thereof and it is to be understood that any modiiications may be made in the exact structural details there shown and described, within the scope of the appended claims, without departing from or exceeding the spirit of the invention.

Referring to the drawings in which like reference numerals indicate like or similar parts:

Figure 1 is a plan View of a machine embodying the principles of this invention.

Figure 2 is a side elevation of the machine shown in Figure 1.

Figure 3 is a vertical section through the ma- Figure 4 is a plan view of the work Xture with certain parts broken away to show the work clamping mechanism.

Figure 5 is a vertical section through a portion of the base of the work xture as viewed on the line 5--5 of Figure 1 showing further details of the work fixture.

Figure 6 is a diagrammatic view showing the electrical interlock between the work fixture and the power control means.

Figure '7 is an enlarged section through the unloading block as viewed on the line I-'I of Figure 1.

Figure 8 is an enlarged view of the work stop as viewed in the line 8-8 of Figure 1.

Figure 9 is a detail view of the trip lever.

Figure 10 is a detail plan View of the same gate.

Figure 11 is a section on the line II-II of Figure 10.

Figure 12 is an enlarged detail view of the cam slot in the stop bar.

Figure 13 is a detail section on the line I3-I3 of Figure 12.

Referring to Figures 1 and 2fof the drawings, the reference numeral I0 indicates, in general, the bed of the broaching machine having upon one end a receiving conveyor, indicated generally by the reference numeral II,upon which work is stored while awaiting process by the machine; and having upon theother'end a delivery conveyor, indicated generally by the reference numeral I2, from whichthe work is automatically delivered to a live conveyor line of a production system. i i

It will be noted that the conveyors are in' alignment with the machine whereby the entire assembly may be inserted in the conveyor line of any production system.

A tool supporting tunnel I3 is supported intermediate the length oi the bed by attachment to the side walls of the bed. This tunnel has a removable tool carrier portion indicated by the reference numeral I4, which is hinged at I5 'and I on a pintle Il. As shown in Figure 3, the tool carrier I4 is provided with a rectangular slot I8 in which the breaching toolN unit I9 is secured and clamped by suitable means. The tool carrier is supportedin cutting position by the pintle I1 on the one side and. by the flat surface 2D on the other side,. the surface 20 being a fixed part of the tunnel. The tool carrier is clamped in position by a series of bolts 2|.

The work is moved from the storage conveyor II into a movable work carrier indicated generally by the reference numeral 22. This carrier has a base 23 as indicated in Figure 3 in which is formed a cylinder 24, and upon opposite sides of the cylinder are guide rails and 26. These guide rails slide in guide ways 21 and 28 which are fixed with and form a. portion of the bed I0. Referring to Figure 5, the cylinder 24 contains a piston 29 which is connected by a double tubular piston rod indicated generally vby numeral 3l] to a xed portion ilof the bed-Figure 6.'l

The plstoncornprises' an inner tubular portion 32 through which iluid is delivered tothe left end of cylinder 24, and an outer tubular member 33, whereby an annular space 34 is provided between; the inner and outer members through which iluid is delivered to the right hand end ci cylinder213,"`

the uid escaping throughl'1f`adliallapertures':3th` Since the volumetric space in the left end of the cylinder is much greater than in the right end of the cylinder, on acoou'ntofptne. space4 occupied by the piston rod, iiuid is delivered.

through the inner tube 32 to effect the feeding movement, and. the Semevelumetrerate Oi. ud is delivered through the annnlarlspace Mita-eifeet the, return. (movement which .Will result l in the. return.. movement.. beine, much. fester; than thefeedinemnvement.

- The cylinder is supplied Witlriluid;v from .a reversible variable delivery pump 36,1whichmay beef known conunercialtype, having acontrol lever 31 which when .throlvnto the. position indicated by thedashand dot `line .3.8. in Figure 6 Willcause the'pumpto.deliverfiiu'dto channel 39 and thereby to the inner tube 32 to effect feeding'movement,.and.when thrown to the position indicated -by .the nlinellikvvill .cau-se the pumpto deliver fluid to channel. 4I and thereby through the space 34 .toi the right: handend of the cylindertoy effect the returnnmovement.

The pump control lever 31 may also be .moved to a neutral position, [indicatedby the line in which the pump will merelyidle..

The pumpjcontrol. lever 31; .is .connectedgby a link 43 to a bell crank 44 which insecured .to the. .en d, of. Ya, shait. 45,. rotatably supported in the .bed ci the machine asindicetedin Fig-nre,

Thel bell l crank is. .alseeennected .by .elink .4S and crank, .411110. .a .contrclshaft48-havinea man..- ual.` control'. lever., 4Q .securedto .the .end Vthereof. Thus, .the pump controLf-al may .be positionedgto eleota. feeding movement `by throwing.'v the. conT trol lever to .the pesitienindicated bv .the .refern ence numeral.. 1.5D,..or .,to; eiect arapid return movement by throwing the levend!! into. Ythe po.-

sition indicated by the numeral 5l.

The, shaft. fis.y adapted. .to be, trip.. controlled `for .automatic vstopping 4and .to this end is. pre: ,y

vided with a 4double-.ended '.crank52-,Figure 9, which has spaced oisetactuating portlons53 and 54.` which lie inthepath of. .dog,s.55 ,andi respectively carried on, the underside; of the. base 23.. as shown in Figure 3...'. f

When the. lever. .43..is thrown rto .the position 5.0, .the portiony 53 isvraised into thepath :of: the dog 55. which is. adjustably .positioned to. .depress the portion, 53jat. the. end .ofthe `f eedi'ngstroke and thereby rotate. the shaft. 45..into a .position to neutralize the. pump... The operator then throws the leverto the position indicated. by the line 5| to. eiectthe, return .movementwhich will be terminated when the doghSldepresses4 the DQrtiOl.1 5,4

The traveling Work,supportano,includes. a vertically adiustable Silbnsuenertor licor. 5.1 .which iS-@Onneeted te thebase. .23-;=byxpairs;.ef parallel lnkelindceted.. by. the. reference. .n.umerals and 5S,l in .Figure 2. These, linksV have. a. pivotal' connection at each end to the parts 23 and 51 and thereby form a parallelogram whereby the top work supporting surface will remain parallel to the cutting plane of the machine in each position of adjustment. The link 59 is provided with a manually operable handle 60 for positioning the sub-support in eitherone ofntwo vertical positions to accommodateywork oftvvo different Stroke.. This. mechanism-.1s more particularly Shevvn in Feuresffi ;and.5;of. the drawings.

The Work comes to the machine on thereceivingconveyor Il -whichisprovidedwith avremmelble.. .Stem Figure 8,- that serves.. to. store. work entheeenvever until themachine. is. ready-nte ref ceiveit,l This; stop comprisesnalever GBL-.which iS pvotally connected-.by .apnrll-toa xed block 68. The lever carrieearhardened insert- .6.3 which is.` adapted to. engage.;the..end of; the work..a.nd prevent further movement. thereof.

The. leverv is also.. provided .with a laterallyV extending .pn 1l) V.whichisz adapted. tolbe. engaged. bv the inclined cam surface lliormedon the` end ofa finger. 12 projecting rearwardlyfromthe work-carrier 2L As the. workcarrier returns, .the camsurface forces thelever. lili4 downwardagainst the resistance one..springactuatedpim13.; The level: .56 has.a..rectangu1ar slot, 14 cut in.-.the:.end thereof.` for embracing-opposite sideso-f anxed block..15.. inwhichy the springlpressed pin v13 `is mounted. The lower face `1li of the slotengages the underside. of,4 the, block .15 vfor limitng.up ward movement. Lateral play of. the. lever .66 is preventedby. apair. of pins 11 `which are driven into. the block.1=5. in .a .position to. engage opposite sides of the lever 66. Thus, when the Work-.carrier retnrnsto itsstarting `position the finger. 12 automatically-removes the ,stop 66 wherebythe workfpiece is free.. to be movedintothe machine onthe rollers` 18.. Thawork'is moved, from the conveyor on to the work :carrier between two uprigntstanchions ,19 ,whichserve to vpivotallylsupporta` backl stop .80A

The .back stop.. amis. y ,U -shaped having. anl .internal latlface 8L for engaging theendof a. 1work piece, and` this face behindl the axisof rotation 82l whereby When.the memberV 80- is-i elevated by thelever*83'itwil.l=move` outvof the path=ofthe worl; so thatJtheworlrm-may rpass, underneath it. After.; Ythe .work haereeest the Sten vielevered intopesitien and: e, pair. 0f. .leterellvexteneee eers 84. engageA .pads onu'the, stanchi'ons 1.9,! fokr .supporting 'the end stopmnosition; 'Ineendtnrust on .the work tafkenx'by. ,the stanchion, .1.94, and to. prevent .wea-r the stanchions .are providedwith hardened inserts; which ell lg ,a'g eI ylrlilletl,ed.)inserte ttahelio ineens?. .siepi @Seher/n in Figure 4.

.the guide` .surface 8l @on theeridtenend thelteral guideJ 81. The lateral guide 81 engages a finished surface 88 which has been preformed on the work piece 8B shown in phantom. These two guides thus serve to positio-n the work in the fixture in two directions, while the adjustable floor serves to position the work in a third direction.

i An interlock has been provided to prevent starting of the machine if the end stop is not in proper position or if the adjustable floor has not been properly positioned for the height of the work piece. In other words, the machine is adapted to handle work of two different heights and if the oor has been elevated with the larger Work piece on it the top of the work would be too high for the broaching tools and a wreck would result.

In order to prevent this, a stop bar 89 is supported on the side of the carrier, as shown in Figure 2, by a pair of bolts 90 which pass through elongated slots 9| formed in the bar. These Slots have end portions lying in different planes for determining different elevations of the stop bar as indicated in Figure l2. This bar is longitudinally shifted by a crank 92 which engages a slot 93 cut in the upper surface of the bar and the crank is secured to the end of a pin 94 which is fixed with the back stop for rotation therewith. As the back stop is raised, the crank 92 is rotated in a counterclockwise direction which moves the stop bar 89 to the right.

This causes the stop bar to be elevated, thereby actuating the trip lever 95 of a limit switch 96 closing a circuit to the solenoid 91, the latter being shown in Figure 6. When this solenoid is energized the armature 98 is projected to prevent rotation of the bell crank 44 in a direction to start the feeding movement of the work carrier. The switch lever 95 has a roller 99 which is made wide enough so that one-half of it will ride on the top of the stop bar 89, and the other half.

will overlap on the work piece.

When the back stop is rotated clockwise into its working position the stop bar 89 is shifted longitudinally and simultaneously lowered, thereby permitting the limit switch to open. It will be apparent, however, that if the work piece is too high that the limit switch control lever will not be able to move do-Wnward due to the overlap of the roller on the work and therefore the solenoid If the Work is of the will remain energized. proper height then the operator can rotate the control lever 49 to start the feeding movement of the work carrier.

A predetermined amount of lost motion is provided between the crank arm and the stop bar to insure that the stop bar is not shifted until near the end of the downward movement of the back stop. A detent is, therefore, provided for holding the stop bar in position while the lost motion is being taken up. This detent is shown in Figures 12 and 13, and comprises a spring pressed ball IBI mounted in a holder |62 carried by the stop bar 89 and engageable with a detent |63 formed in the side 88.

As the work carrier starts its forward movement four pivotally mounted clamps 99' are automatically actuated to clamp the work to the carrier. As shown in Figure 3, the clamps 99' are pivotally mounted on pins |90 carried by the sub-support 51 of the carrier. One end of each clamp is provided with a hardened insert ml which engages the work, while the other end is bifurcated for connection to an actuating plunger by means of a cross pin |02. The cross pin extends into a radial elongatedslct |03 formed in the end of the `clamp 99 to provide clearance due to the arcuate movement of the clamp member. Referring to Figure 4, there are four actuating plungers4 |04, |65, |06 and |01 slidably mounted in the sub-support 51 and operatively connected to the respective clamps. The plungers |04 and |95 are arranged in a pair with their adjacent ends engaging camming ribs |09 and |08 respectively formed on the underside of a cam member Hil. It will be noted that the ribs extend at an angle of about 45 degrees to the direction of movement of the plungers. When member ID is moved toward the right, as viewed in Figure 4, the ribs |98 and |09 engage the angular faces and ||2 of slots H3 and ||4 formed in the ends of the plungers, and thereby pull the plungers toward one another to ,effect unclamping of the Work. When the cam ||9 is moved in the opposite direction or toward the left, as viewed in Figure 4, the ribs |98 and |99 engage angular faces ||5 and H5 to effect an outward rapid movement of the plungers and thereby rapid movement of the clamping members 99' into clamping position. The faces ||5 and IIB are cut away to form surfaces ||1 and I8 which are of a low angle and engageable by corresponding surfaces ||9 and |20'on the cam ||0 for effecting a high pressure wedging or clamping action to effect final clamping of the work.

It will be noticed that when the low angle surfaces |1 and I9 are in engagement that a large movement of the cam member l0 eiects a small movement of the clamping members. The cam I l0 is supported on the bottom plate |2| of the sub-support 51, and the cam carries a pin |22 which extends into an enlarged hole 23 formed in a longitudinally movable link 24. A spring |25 is interposed between the link |24 and the cam III] for urging the'"carn in a direction to remove normally lost motion between the pin |22 and one end of the slot |23.

A second spring |29 is interposed between the end of the link |24 and a wedge block |21, the

7 latter having a lost motion connection at |28 consisting of a pin and elongated slot with the link |24. The wedge block |21 has a tapered surface |28 engaging a tapered surface |29 formed on the underside of a block |30 which is xed with the bed 23. The link |24 has a roller |3| mounted in the bifurcated end thereof and a pin |32 which serves to hold the roller in the bifurcated slot, projects beyond one side of the link whereby the periphery of the roller may engage one cam surface |33 and the periphery of the pin may engage an opposing cam surface |34 on a crosswise moving actuator |35.

By referring to Figure 4 it will be noted that the cam surface |33 has a high angle portion |35 and a lower angle portion |31 whereby upon movement in one direction the surface |36 will effect a rapid movement of the link and then a slow movement to effect clamping and upon movement in the other direction the cam surface |34 will act on the end of the pin |32 to eiect retraction of the link |24 and thereby release of the clamping member.

A duplicate of this mechanism is provided for actuating the plungers |96 and |61 and repetition of the description is not believed to be necessary. The member |35 has an actuating plunger |38 secured to it and projecting beyond opposite sides of the carrier, one end of the plunger having a roller |39 mounted in the bifurcated end thereof and held for rotation therein liya pin 1|48l The other endloftheplunger- |38 has afiroller; l4f| attached .to` the :uppervsi'de-"thereofzbya-pinsl I,421so1 asto project above theftop surface-'1 of thezvplunger.

As; thelcarri'er feedsl toward Y'the left; as-viewed in Figure. 1,' the.y roller. |4| engages a1cam2|43 which forces' thepiungery |3'8 infy a-directionito eillectlclamping of thezwork and actuation-ofthe wedgei'blocks: |21 which clampsithe/sub-support 51 intotightengagement with. the b'ed y23. When thei'WorkLcarri'er.' emerges from the: tunn'eiafter thebroachinggoperatiom.af second cam- |44- en'-V gages the roller: |39 andiforces' the plunger' |38 inn the: opposite.. direction to effect unclamp'in'g ofithef'work.- At thistimethe roller |4| has passedbeyond' the' end fof a" long rail '|45 fand this railhasrafbeveled end |46'for?engaging thezroller |41 upon r the .return movement of the: 'carrier wherebyfthe: plunger |38 isvh'eld-*in a worll:1 un# clamping; position.' duringi.-v return movement of the if carrier.' through= f the:v tunnel. 'Y In order that the roller' |41 may again'fbeaactuatedfby the-cam I 431,5 the=rail I 45 isiprovidedtwitlr ai gate1t41 Iwhich is l`fpivotally'. supported 'on 'a1 .pin f 4&fas F shown' lin Eigures 10 'and 1l'.i As,` the :rollen freturnsi it iengages :th'ei beveled?V underside |4Sfof thev gate f|4| and :it so.' that Ithe rollermay/passthrough. After theroller thas passed-fbeyondfthe wgate; it dropssinto positiontopresent thercam surface |50 to the roller upon its next advancing movement.4

It will now be-evident--thatlwiththelwork' in proper positionI intthe carrier theop'erati.' throws the vlever 49' into .a feeding position 'anni the carrier is'hydraulically lfed through thei tunnel to effect ai breaching` operation;y Asfitenters the tunnelthe work-is :automatically clamped' and-as the' carrier emerges 'from the A tunnel the fworkl is automatically l unclamp'ed. Aso shown: `in- Fig-ure 9; a 'detent mechanism lis provided Xfori holding thestarting lever 49 in a-vrunning positionv This mechanism `comprises afdetent flever Y 5|? fwhich is pivotally mounted at |52 onthe'xedipart -of the machine Tandy aspring f| 53 continuouslyurges the lever into engagement with anotchedfdetent plate-154 "keyed tothe-'shaft .45. The plate is provided withA three'` lnotches to L- correspond-to the three positions ofthe' control lever.

When: the shaft45 is rotatedto it'sioedwforwardposition the actuation rportion -53 '-of-'l the tripv1ever52 isgfrotatod clockwise-as Aviewed-iin Figure f 9-into the path.- of dog 53?v whereby at the end ofthe l feeding stroke the -dog-.willf rotate the shaft andthereby position'thepump control in: a` neutral position and thereby-1 automatically stopfthe feeding movement. l

Means` are provided for automatically unloading the Work*duringthereturnmovementot the Werl;Av carrier: and the unloading'meehanism is connectedforactuation by the carrier lduring its idle return.movement.-` I f This mechanism y comprises. ari-unloading V`block |55,fshown in -detail-inaFigure'. The blockf-is H.shaped, having'A longitudinal 4I ngnnbers lprovided" with grooves for receiving cables '|56 and |511' by'v clamping members |58; l The` are stretched over pulleys l |59 rotatably,L supported cableseare securedtothe `carrier 22`-, Figure y6. f

Thus,- wher-inthe carrier moves toward the left onits-.feeding fstroke; the-unloading bleck-is moved toward Athe right 0x1- toward :the conveyor, and -it islso positioned that a work engaging'fn- `ger Hill-which` is l resiliently held in A an i upright position, -Figu-re `7, will snap, under `thew0rk fso f The 4two' cablesare clamped to the-block i 'zgaasgaav unloader to pull the work oppositedirection ofi of'thecarrier and ontothe 'live part kof the conveyor system.V

Thus; without any attentiony -on the part of the operator thel work isl automatically unclamped` and then'automatically unloaded.V When the carrier reaches its-returnor starting position the dog.58engages the portion 54 ofthe trip lever and stopsl the return movement,y at which time theinger 'l2 has depressed the-stop 66 so'that the operator may move thev next work piece onto the-carrier;

There has thus been provided an improved breaching `machine W-hionisso constructed that it lmay be placed in the conveyorline Voa high productionf--system fand constructed-in a man'- ner to readily` receive-work from the conveyor system, machine it land' transmit it onto thejconveyor system without any lostmotion and in a. highlyY eflicientlmanner.l

What is claimed is-z 'a 1. In a broaching'machine having vaebroachin tool support and a' WorkVsupport, the* combina- .tionofpower means for effecting relative advance movement between the supports-'to eiecta broachingoperation, control means effective on saidpower meansfor producing a relative ret-urn movement between* the supportsfand means ldejlriving4 power 'from'thei returning support toslide the nished workpiece from the "worksupporh 2. Infa machine tool'hfaving a. tool support and a traveling work support, the combination of power operable means for feeding said worksupport re1- ativeto thetool support toeiect a machiningk operation -on-a work piece carried nby the work support andfor rapidlyreturning the Work suplport; an unloadingfblockfhaving means,` engageable witha worli-y piece carriedi by thel work sup'- port at theend of the'feedingstrokeand motion transmitting A connections from' the' work i support for causing movement of the'unloadingfblock in the opposite direction with respect tothe .movement of -thereturningfwork's'upport to effect automatic unloading of the work'fSllPpOrt.v

lin-one direction past the tool suppotQax'id additional. means actuated by said poweroperable means for continuing the movement of the work pieceY in the same direction while effecting a return movement of the Work support.

4.A In a breaching machine having a bedQa tun# nel supported onsai'd` bed and :having a.j breaching .tool supported interiorly thereof-Q a work carrier s lidably mounted on said for movement' through `said tunnel; hydraulically operated means forfreciprocating'the work carrier, 'a'wv'orrk unloading block havin-g means for engaging a work piece "on the carrier,A motion transmitting meansI connecting thecarrier-to theunloading block in a manner to'effect movement of theblo'clg :in aldirectionvoppositel-to the movement of the carrier whereby a work piece will be removed from the carrier during the return movement thereof.

5. In a broaching machine having a bed, and a work carrier and a cutting tool supported thereon, the combination of an adjustable subsupport mounted on the work carrier for positioning work of variable dimensions in the cutting plane of said tool, means to lock said subsuppert in a plurality of positions in accordance with the dimension of the work, power operable means for effecting relative movement between the carrier and the tool including a starting control, and means responsive to the height of the work for preventing movement of the starting control if the sub-support is improperly positioned.

6. In a broaching machine having a support and a surface broaching tool fixed to said support, the combination of a work carrier having work supporting means lying in a plane parallel to the cutting plane of the broaching tool, means to adjust said work supporting means toward and from said cutting plane whereby work pieces of different heights may be broached with the same broaching tool, power operable means for effecting relative movement between the tool and work, and means to prevent operation of said power operable means if the height of the positioned work exceeds a prescribed amount.

'7. In a broaching machine having a tool support, a work support and power operable means for effecting relative movement between the supports, the combination with a starting control lever for said power operable means, of means to prevent shifting of said lever to a running position, including a control member, a backstop mounted on the work support and movable into position behind the work for absorbing the cutting thrust thereon, and means supporting said control member in a position to be responsive to the height of the work and to the position of said backstop.

8. A broaching machine of the character described, including a hollow frame providing a work receiving tunnel, means for translating work to be broached within the tunnel, said frame having a longitudinally extending aperture formed therein, a trunnion member carried by the frame at one side of the aperture, a broach holder oscillatably supported by the trunnion and bearing, a broaching tool projectable through the aperture of the frame in the direction of the work, and means for securing the holder to the frame with the broaching tool projecting interiorly thereof for work piece engagement.

9. A broaching machine of the character described including a bed, a work carrier translatable along the bed, a frame carried by the bed, broaching members mounted on the frame in xed relation to the frame and bed, and means for selective proper presentation of different dimentions of work pieces in operative relation to the fixed broaching tool, including a supplemental support mounted on the carrier, means for selectively holding the supplemental support in different prescribed positions with respect to the carrier in accordance with the dimension of work piece to be operated upon, and means for securing the supported work piece to the support and carrier for translation therewith with respect to the broaching tool.

10. A broaching machine of the character described including a bed, a work carrier translatable along the bed, a frame carried by the bed, broaching members mounted on the frame in fixed relation to the frame and bed, and means for selective proper presentation of different dimensions of work pieces in operative relation to the fixed broaching tool, including a supplemental support mounted on the carrier, means for selectively holding the supplemental support in different prescribed positions with respect to the carrier in accordance with the dimension of work piece to be operated upon, means for securing the supported work piece to the support and carrier for translation therewith with respect to the broaching tool, means for initiating translation of the work through a cutting stroke, and a gage device contactable with the work in advance of the broach, and connections between the gage device and the control means for preventing movement of an overdimension work piece into engagement with the broach.

1l. In a machine of the character described, the combination with a translatable work carrier and a broach disposed for engagement with a work piece on the carrier, means for retaining a work piece in position on the carrier, and a controller for determining the movement of the carrier in the direction of the broach, and a gage member having portions cooperating respectively with the work retaining means and with the work and displaceable thereby, and operative connections between the gaging member and the controller for determining the effective actuation of the latter, whereby movement of the carrier with an oversize or improperly restrained work piece is prevented.

EMERY C. RAEHRS. CARL M. BEACH. 

